Package: src:mathgl Version: 2.4.2.1-2 Severity: serious Tags: sid buster patch mathgl ftbfs with Python3.7. It hard codes 3.6 instead of 3.7. So maybe generalize that, or explicitly b-d on a specific python3.x version. Not so nice fix at http://launchpadlibrarian.net/395599026/mathgl_2.4.2.1-2build1_2.4.2.1-2ubuntu1.diff.gz